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Science Prezi

Work, Power, Mechanical Advantage, and Efficiency
by

Rebecca Aristotelidis

on 11 April 2013

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Transcript of Science Prezi

By: Rebecca Aristotelidis Work, Power, Mechanical Advantage, and Efficiency Efficiency Power Work the ratio of the energy delivered (output work) by a machine to the energy needed (input work) in operating the machine power is the source of energy used to operate a machine or other system the transfer of energy from one object to another work is always measured in Joules work is done when a force causes an object to move in the direction of the force. if there is no motion, then there is no work to find Work you multiply Force and the Distance W= FxD and it is the rate (time period) at which work is done
power is always measured in watts the formula for power is work divided by time P=W/t Mechanical Advantage MA=output F/input F mechanical advantage is the ratio of the force produced by a machine to the force applied to it (the ratio of the output force compared the input force) Mechanical Advantage allows machines to do more work with less effort the formula is the output force divided by the input force efficiency is often expressed in a percentage E=W output/ W input x 100 the formula for efficiency is the work input divided by the work output multiplied by 100 THE END!
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